ORDER CXV. AMENTACEiE. 505 



Order CXIV.— SAURURA'CEJE. 



Flowers naked, seated upon a scale. Stamens G, bypogy- 

 nous, filaments slender. Anthers cuneate. Ovaries 4, distinct, 

 each with 1 ovule. Stigmas 3 — 4. Fruit consisting- of 4 in- 

 dehiscent nuts. Leaves alternate, stipulate. Flowers in spikes. 

 Herbaceous plants, growing in marshy places. 



Genus I— SAURU'RUS: L. 7—4. 



(From saura, lizard, and our a, tail.) 



Genus the same as the Order. 



1. S. cer'nuus, (L.) Stem erect, furrowed, with jointed hairs. 

 Leaves cordate, pubescent, entire. Flowers in spikes, opposite the leaves. 

 Perianth tubular, hairy, split on the upper 6ide. — 2£. May — July. 

 Bogs and ponds. Very common. 2 — 3 feet. 



Order CXV.— AMENTA'CE^E. 



Flowers monoecious or dioecious. Sterile florets in aments, 

 with scales, or scaly perianth. Stamens inserted into the scales. 

 Anthers 2-celled. Fertile florets in aments, with scales or pe- 

 rianths. Ovary free, simple. Stigmas many. Fruit a drupe, 

 or a bony, membranaceous capsule, usually 1 -celled. Seed 1, 

 or many. Trees or shrubs. 



ANALYSIS. 



1. Flowers without calyx or corolla 2 



Flowers with at least a bract-like calyx 5 



2. Fruit capsular 3 



Fruit uot capsular 4 



3. Capsule 1-celled Salix, 1 



Capsule 2-celled Populus, 2 



4. Fruit a drupe Myrica, 3 



Fruit a round bur Comptonia, 4 



5. Fruit cone-like 6 



Fruit not cone-like 8 



6. Middle-sized or large trees Betula, 5 



Shrubs Alnus, 6 



Small trees 7 



7. Scales 2-flowered Carpintis, 7 



Scales 1-flowered Ostrya, S 



B. Fertile aments globose 9 



Fertile aments not globose 10 



9. Fertile aments on long peduncles Plaianux, 9 



Fertile atnents near the base of the sterile Liquidambar, 10 



10. Fruit an acorn Quercus, 1 1 



Fruit a prickly bur Ca-atanea, 12 



Nut ovate Cory lux, 13 



Nut triquetrous Fnr/u», 14 



22 



